Patent US3216933A successfully refreshed from Google Patents.
US3216933A
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Method for preventing drill pipe from sticking
Assignee: Pan American Petroleum Corp
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Filing: 1962-08-02
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Granted: 1965-11-09
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Expires: 1982-08-02
Abstract
No abstract record available.
Inventors
- 👤 Park Arthur
- 👤 James L Lummus
- 👤 Jr Platho P Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:00
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; E; E21; E21B; E21B31/00; E21B31/035; C09K2208/00; C09K2208/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN A METHOD FOR PREVENTING THE OCCURRENCE OF DIFFERENTIALLY STUCK DRILL PIPE WHEREIN A WELL IS BEING DRILLED INTO A FORMATION USING A LIQUID DRILLING FLUID AND WHEREIN THERE IS A PRONOUNCED TENDENCY FOR SAID PIPE TO BECOME STUCK TO THE WALL OF SAID WELL, THE IMPROVEMENT WHICH COMPRISES INCORPORATING INTO SAID FLUID ABOUT 10 TO ABOUT 30 POUNDS PER BARREL OF STEEL SHOT RANGING IN SIZE FROM ABOUT 10 TO ABOUT 40 MESH.
Claim 2
Dependent Claim
74 words
IN A METHOD FOR PREVENTING THE OCCURRENCE OF DIFFERENTIALLY STUCK DRILL PIPE WHEREIN A WELL IS BEING DRILLED INTO A FORMATION USING A LIQUID DRILLING FLUID AND WHEREIN THERE IS A PRONOUNCED TENDENCY FOR SAID PIPE TO BECOME STUCK TO THE WALL OF SAID WELL, THE IMPROVEMENT WHICH COMPRISES INCORPORATING INTO SAID FLUID ABOUT 10 TO ABOUT 30 POUNDS PER BARREL OF STEEL SHOT RANGING IN SIZE FROM ABOUT 10 TO ABOUT 40 MESH.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |